Art of making castings.



W. G. URBAN.

ART OF MAKING OASTINGS.

APPLICATION FILED FEB.18, 1913.

1,1 12,496; Patented Oct. 6, 1914.

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ART OF MAKING CASTINGS.

APPLICATION FILED FEB. 1a, 1913.

1,1 1 2,496. Ptitented Oct. 6, 1914.

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WILLIAM C. URBAN, OF GRANITE CITY, ILLINOIS, ASSIGNOR OF ONE-HALF TO I-IOYT METAL COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION.

ART OF MAKING CASTINGS.

Specification of Letters Patent.

Patented Oct. 6, 1914.

Application filed February 13, 1913. Serial No. 748,096.

Madison and State of Illinois, have 111- vented certain new and useful Improvements in the Art of Making Castings, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to the art of making castings and has for its object the production of a process w ereby molten metal may be delivered to a mold or die in a pure condition, free from the dross which accumulates at the surface of the metal in the melting pot. Also, to provide a process whereby the molten metal may be forced into the die under pressure, without liability of injuring the operator.

Another object is to confine the molten metal so that it will not cool to any appreciable extent in flowing from the melting pot to the die.

Figure I is a side elevation, partly in section, of. an apparatus suitable for use in carrying out my process. Fig. II is a top or plan view of the apparatus, some of the parts being shown in section. Fig. III is a view similar to Fig. I, showing the valves and valve operating devices in diiferent positions. v

In the accompanying drawings which illustrate an apparatus for carrying out my process, 1 designates upright posts connected at their upper ends by a cross bar 2. Hanger rods 3, secured to the cross bar 2, support a receptacle 4. This receptacle is 10 preferably a melting pot, having an outer or primary compartment A, open at the top for the reception of metal to be melted, and an inner or secondary compartment B, adapted to receive molten metal from the 15 outer compartment. 5 designates an admission valve for opening and closing communication between said inner and outer compartments. The vah'e 5 and the passageway controlled thereby is located near the bottom of the melting pot, so that the through which the molten metal may be discharged into a die 7.

8 designates a discharge valve for openlng and closing the discharge opening 6 while the admission valve is closed, said discharge valve 8 having a long stem 9 passing through the closed upper end of the compartment B and extending above the transverse frame bar 10 at the upper end of the apparatus. A compression spring 11 for forcing the valve 8 onto its seat surrounds the valve stem 9, and is arranged between the bar 10 and a collar 12 on said stem. The means for opening the discharge valve 8 comprises an operating handle 13, in the form of a lever pivoted at 14, and carrying a swiveled device 15 having a lip 16, which lies below the collar 12 and surrounds the valve stem 9. \Vhen the lever 13 is elevated, it carries the swiveled device 15 upwardly into engagement with the collar 12 and, as said collar is rigidly secured to the valve stem 9, a continued movement of the lever will open the valve 8 and allow the molten metal to flow into the die 7.

Air under pressure is admitted to the upper portion of the chamber B through a pipe 17, the admission of air being controlled by an air valve 18 having an operating handle 19 connected by a link 20 to the lever 13. When the lever 13 is rocked upwardly to open the discharge valve 8, the air valve 18 rocks from the position shown in Fig. II, thereby allowing the air under pressure to enter the inner compartment B, with the result of forcing the molten metal through the dischargeopen ing 6 and into the die 7. To cause the air valve 18 to open and admit the compressed air to the compartment B before the discharge valve 8 opens, the swiveled device sult of openin the discharge valve 8 and permitting the air under pressure to force the molten metal through the discharge opening 6.

The inner compartment B may be supcharge valve is closed, said admission valve sion vane 5 isopen,

being controlled by a handle 22 secured to the valve stem 23. To permit the escape of air from the inner compartment 13 while it is receiving molten metal from the outer compartment, the casin of the air valve 18 is provided with a 'vent' 24, (Fig. I),

and the valve 18 is provided with an auxiliary port 25, through which air may pass from the inner compartment to the main port in valve 18, and thereafter escape through the vent 24:.

If the air valve 18 were accidentally opened to admit air under pressure to the inner compartment B while the admission valve is open, it will be noted that the molten metal would be forced through the valve 5 and discharged into the atmosphere through. the open upper end of the outer compartment A. To positively prevent such accidental opening of the air valve 18, the valve stem 23 secured to the admission valve 5 is provided with a stop arm 26 which lies directly'over the lever 13 when the admis- (see Figs. 1 and II). This stop arm islocated to prevent the lever 13 from being elevated, thereby preventing the air valve 18 and discharge valve 8 from being opened while the admission valve 5 occupies its open position. When the mission valve 5is closed, the stop arm 26 is located in the position shown by dotted lines, (Fig. Ill), where it does not. in any way interfere with the operation of the leverv 13.

The apparatus I have shown for carrying out my method is shown, claimed in an application for patent filed by me Feb. 13, 1913, Serial No. 748,097, Casting apparatus.

I claim In the art of making castings, the process which consists in confining molten material in a primary and a secondary compartment, the latter being provided with an admission port through which molten material may flow from the primary compartment and with a discharge portthrough which the molten material is'discharged; closing said discharge port to prevent the escape of molten material from the secondary compartment, opening and closing the admission port while the discharge port is closed, introducing fluid under pressure into the secondary compartment, and opening and closing the discharge port while the admission port is closed.

v w. c. URBAN.

in the presence of A. J. MOCAULEY, E. B. LINN.

described and 

